High-tension or spark-type electric igniter

Claim 1

A SPARK TYPE ELECTRIC IGNITER COMPRISING IN COMBINATION A HOLLOW METAL BODY HAVING A LOWER OPENING AND CONTAINING, MOUNTED IN THE BODY: A METAL FIRST ELECTRODE HAVING A RELATIVELY LARGE SUBSTANTIALLY FLAT FACE, A DIELECTRIC LAYER OVERLYING AND ADJOINING SAID FACE OF THE FIRST ELECTRODE, A SECOND ELECTRODE OVERLYING AND ADJOINING THE DIELECTRIC LAYER, AN EXPLOSIVE CHARGE OVERLYING AND TOUCHING THE SECOND ELECTRODE, THE FIRST ELECTRODE BEING ACCESSIBLE FROM OUTSIDE THE BODY THROUGH SAID OPENING, MEANS ELECTRICALLY INSULATING THE FIRST ELECTRODE FROM THE BODY, THE SECOND ELECTRODE CONSISTING OF AN ELECTRICALLY CONDUCTIVE EXPLOSIVE MATERIAL AND IN ELECTRICAL CONTACT WITH THE BODY, WHEREBY WHEN A SOURCE OF ELECTRICITY IS CONNECTED TO THE BODY AND THE FIRST ELECTRODE FOR GENERATING AN ELECTRIC CURRENT IN THE BODY, THE SECOND ELECTRODE AND THE FIRST ELECTRODE SO AS TO GENERATE AN ELECTRIC SPARK ACROSS THE DIELECTRIC LAYER SAID CONDUCTIVE EXPLOSIVE MATERIAL IS IGNITED BY SAID SPARK AND CAUSES IGNITION OF SAID EXPLOSIVE CHARGE, THE ELECTRICAL CHARACTERISTICS OF SAID CONDUCTIVE EXPLOSIVE MATERIAL RELATIVE TO THOSE OF SAID DIELECTRIC LAYER BEING SUCH THAT IT ALLOWS THE PASSAGE OF SAID CURRENT THERETHROUGH WITHOUT BEING DIRECTLY IGNITED BY SAID PASSAGE OF SAID CURRENT AS A RESULT OF THE JOULE EFFECT.